Annual vs Per-Project Contract Works Insurance: Which Suits Your Building Business?

The short answer: a single-project contract works policy insures one named build for its construction period, priced on that project’s value. An annual (sometimes called open or blanket) contract works policy insures the projects you start over a 12-month period, priced on your estimated annual turnover, with a cap on the largest single project it will automatically cover.

If you’re quoting contract works insurance job by job and it’s starting to feel like admin you do every month, the annual structure is probably the question you’re really asking about. This article covers how each structure works, how underwriters price them in 2026, and the practical signals that a building business has outgrown per-project quoting.

Key takeaways

• Single-project cover is priced on one contract value; annual cover is priced on declared turnover.
• Annual policies carry a maximum project value cap. Jobs above it need separate agreement.
• Turnover declarations are adjustable. Minimum premiums can limit refunds if you overdeclare.
• Multiple projects a year, or jobs starting before cover is arranged, are the classic outgrow signals.
• Neither structure replaces public liability. They answer different questions.

How does a single-project contract works policy work?

A single-project policy covers one specific build, at one specified site, for the expected construction period. The insurer prices the project itself: contract value, location, the type of work, the build method, who’s doing it and for how long.

That specificity is the strength. The underwriter sees exactly what they’re insuring, which suits owner-builders, one-off developments and builders who only take on the occasional insurable project. Our project-specific contract works page walks through the structure in more detail.

Here’s an example from our own placements. In early 2026, a NSW builder came to Tank Insurance for a new attached dual occupancy, project value $800,000, with a 15-month construction period and most trades subcontracted. We approached three underwriters, and placed the project with Mecon for approximately $4,500. One policy, one site, done.

The trade-off is repetition. Every new job means a new proposal, a new quote round and a new policy start date to manage. Miss that last step and you’re building uninsured, which creates its own underwriting problem. We’ve covered what happens when cover is arranged after works have started separately, and the short version is: harder market, more questions, more evidence.

How does an annual contract works policy work?

An annual policy covers the projects you commence during the policy period, without quoting each one individually. Instead of pricing a single contract, the insurer prices your year: estimated annual turnover, the mix of work, and the largest single project you expect to run.

Three numbers do most of the work:

1. Estimated annual turnover. The projected value of work for the coming 12 months. This is the main rating base, so it needs to be a genuine estimate, not a hopeful one and not a sandbagged one.
2. Maximum project value. The largest single contract the policy will automatically cover. Land a job above the cap and it isn’t automatically insured; it gets referred to the insurer for separate agreement or written on its own policy.
3. The work split. New residential vs renovations vs commercial vs civil. Insurers rate these differently, and a material shift in your mix mid-year is worth telling your broker about.

The payoff is operational. Once the annual policy is in place, an eligible new project under the cap is covered when it starts. No per-job quote round, no gap between winning the work and being insured for it. Our annual contract works policies page covers the structure in depth.

What happens with the turnover declaration at the end of the year?

Annual contract works policies are commonly adjustable: you declare an estimated turnover up front, and the actuals get reviewed at renewal or expiry. If you wrote more than you declared, an additional premium can apply. If you wrote less, a return premium may apply, but minimum premiums can limit how much comes back.

That second scenario is not hypothetical. On one annual policy Tank Insurance manages, the builder declared $1.5 million in expected turnover and the year came in around $300,000 when work slowed. At renewal, the quotes that came back were sitting at insurer minimum premiums, which is exactly the mechanism that limits what an overdeclared year returns.

The practical lesson: a realistic declaration, with a mid-year update to the broker if the pipeline changes materially in either direction, avoids both ends of that problem. An annual policy priced on a fantasy turnover figure is a cost problem in a slow year and a disclosure problem in a busy one.

Which costs less: annual or per-project?

It depends on how much you build in a year, and neither structure is automatically cheaper. A single-project policy prices one contract; an annual policy prices your whole declared year, subject to minimum premiums.

Some reference points from Tank Insurance placements and quote rounds:

Scenario	Structure	Indicative premium
One NSW dual occupancy, $800,000 project value, 15 months	Single project	Approximately $4,500 (placed 2026)
Residential builder, annual policy renewal, quotes from four markets	Annual	Approximately $8,600 to $9,200 (2025 renewal round)
New construction entity, approximately $300,000 first-year turnover, annual contract works with $20 million public liability	Annual combined	Approximately $3,500 to $5,400 across three quoting markets (2026)

Those are real figures from our files, rounded up, and they’re indicative only: your work mix, claims history, experience and project sizes will move the numbers. For a fuller breakdown of what drives pricing, see our contract works insurance cost guide.

The pattern worth noticing: a builder running one $800,000 job pays for that job. A builder running four of them under an annual policy isn’t paying four separate single-project premiums, but is paying for the declared turnover. Where those lines cross depends entirely on your year, which is why we quote both structures side by side when a builder is near the boundary.

When does a builder outgrow per-project quoting?

The clearest signal is frequency: when new projects are starting often enough that quoting each one is creating admin load, timing risk, or both. If a job has ever commenced before its policy did, the structure is telling you something.

Other signals from our own enquiry flow:

• You’re a licensed builder running multiple concurrent sites. Per-project placement multiplies paperwork with every active site.
• Project start dates move. Single-project policies are placed for a start date. When starts slip and shuffle, an annual structure absorbs the movement.
• You’re winning work at short notice. One 2026 placement of ours was a newly established construction company that needed annual contract works and $20 million public liability arranged within days of engagement. An annual structure meant every subsequent job under the cap was covered from commencement without another quote round.
• Your projects cluster under a predictable cap. If everything you build sits under, say, $1 million, an annual policy with a suitable maximum project value covers the lot.

The counter-signals matter too. An owner-builder doing one renovation, or a developer with a single build and nothing else planned, has no year to insure. One project, one policy.

The enquiry data across our own pipeline reflects both ends of that spectrum. Contract works enquiries at Tank Insurance have grown from 4 in 2023 to 56 in 2026 to mid July:

And here’s the part that motivated this article. Of the 85 contract works deals in that pull, only 25 arrived specifying a structure. The other 60 enquired for “contract works” without saying whether they meant one project or a year of them:

That’s not a criticism of the builders. It’s a sign the structure decision usually happens in the quoting conversation, not before it, and that’s fine. It’s what the broker is for.

What will an underwriter ask for?

For either structure, expect questions about who you are and what you build. For an annual policy specifically, the proposal centres on the year rather than the site.

From our quote rounds, the core set looks like this:

• Turnover or project value. The single project’s contract value, or the estimated annual turnover.
• Work split. Percentages across new residential, renovations, commercial, civil and other. Insurers ask for this as a literal breakdown.
• Largest project value. For annual policies, this sets the maximum project value cap discussion.
• Subcontractor use. What proportion of work is subcontracted, and to which trades.
• Experience and licensing. Years in the game and the relevant state licence. On one 2025 renewal round, an insurer declined to quote a builder specifically because they wanted four years of experience. Others on the same round quoted, which is the argument for approaching more than one market.
• Claims history. Prior contract works or liability claims.
• Location of works. States, and metro vs regional split.
• Anything unusual. Demolition, excavation depth, heritage structures, relocated dwellings. On a 2026 single-project placement of ours, a relocated early-1900s Queenslander under renovation, the building’s age and construction were central to which of the three quoting insurers was competitive.

A well-prepared proposal with these answers up front shortens the quote round for either structure.

Does either structure replace public liability insurance?

No. Contract works covers physical loss or damage to the works themselves during construction: the half-built structure, materials on site, and related project exposures depending on the wording. Public liability responds to third-party injury or property damage claims. They’re different questions, and in Tank Insurance’s placements the two are frequently quoted together.

We’ve written a full comparison at contract works vs public liability if you want the detail on where each policy starts and stops. Annual contract works and annual public liability are frequently quoted as a package, which is how that 2026 new-entity placement above was structured.

Frequently asked questions

Should I get annual or single project contract works insurance?

It turns on your year, not the product. One insurable project with nothing else planned points to a single-project policy. Multiple projects starting through the year, jobs won at short notice, or per-project quoting creating timing gaps all point to an annual structure. When a builder sits near the boundary, quoting both side by side answers the question with numbers instead of theory.

Can an annual contract works policy cover a project bigger than my maximum project value?

Not automatically. A contract above the cap needs to be referred to the insurer for agreement, sometimes with an additional premium, or placed on a standalone single-project policy alongside the annual one. The two structures aren’t mutually exclusive; running an annual policy for the regular work and a separate policy for an outsized job is a normal arrangement.

What happens if I underestimate my turnover on an annual contract works policy?

Annual policies are commonly adjustable, so an end-of-period declaration above the estimate can trigger an additional premium. The bigger risk is placing more work than the policy was rated for without telling anyone. A realistic declaration, updated when the pipeline changes materially, avoids both problems.

Do owner-builders need annual or single project contract works insurance?

An owner-builder is, almost by definition, running one project, so single-project cover is the relevant structure. We’ve placed single-project cover for owner-builders, including a QLD owner-builder renovating a relocated early-1900s Queenslander over 18 months in 2026. The annual structure exists for businesses with a year of projects to insure.

Is contract works insurance the same as home warranty or home building compensation?

No. Home building compensation in NSW and its state equivalents are statutory schemes protecting homeowners on eligible residential work. Contract works is a commercial policy covering physical loss or damage to the works during construction. A residential builder may need both, but one never substitutes for the other.

Getting the structure right

The annual vs per-project question is really a question about your next 12 months. One project: insure the project. A pipeline of them: insure the year, set the maximum project value cap to fit the work you actually win, and declare a turnover you’d be comfortable defending at adjustment time.

Tank Insurance places both structures, from single owner-builder renovations to annual programs for licensed builders, and quotes them across multiple markets including Mecon, 360 Underwriting, CGU and Hutch. If you’re not sure which side of the line your business sits on in 2026, that’s exactly the conversation to have before the next job starts.

Weighing up annual vs per-project cover? Reach out to our team at 02 9000 1155 or [email protected] with your expected turnover and typical project sizes, and we’ll quote the structures side by side.

This is general information only and does not take into account your objectives, financial situation, or needs. You should consider whether the information is appropriate for you and read the relevant Product Disclosure Statement (PDS) before making any decisions about insurance products.